Hydraulic swivel



Dec. i8, 1923. V

L. J. BLACK HYDRAULIC SWIVEL Filed, Aug. 19. 1922 atlfommq.

" Watershead, the swivel stem passing into the stuing box, and the interior of the Waterhead forming an' oil reservoir,the aforesaid stuiing boX extension having oil ducts leading from the oil reservoir to the packingr space of the stuffing box, and a Water-supply connection on the upper end of the stu-lling box extension and opening into the interior thereof.

4. In a hydraulic swivel, a hollow Waterhead having` top and bottom openings, a, stuifing box having a base which is secured in the bottom opening, and a hollow extension projecting upwardly from the base through the interior of the Water-head, said extension passing through the top opening of the water-head, a lock `nut carried by the upper end of the extension and engaging the Jiop of the Water-head, and a swivel stein passing into the stuiiing boX, the interior of the Water-head forming an oil reservoir and the aforesaid stuiing boxv extensionr having oil ducts leading from the reservoir to the packing space of the stufiing box.

5. In a hydraulic swivel, a hollow Water- `head having top and bottom openings, a

stuiing boa having a base which is secured in the bottom opening, and a hollow ex tension projecting upwardly from the base through the exterior of the Water-head, said extension passing through the top opening of the Water-head, a look nut Carried by the upper end of the extension and engaging the top, of the water-head, a swivel stern passing into the stuffing box, the interior of the Water-head forming an oil reservoir and the aforesaid stufing box extension. having oil ducts leading from the reservoir to the packing space of the stuiing box, andl `a `Watersupply connection on the upper end of the st'ufng box extension and opening into the interior thereof.

In testimony whereof I aiiix my signature.

LEE J. BLACK. 

